[PATCH v3 1/7] riscv: Add DMA 64-bit address support

[Padmarao Begari]

dma_addr_t holds any valid DMA address. If the DMA API only uses 32/64-bit
addresses, dma_addr_t need only be 32/64 bits wide.

Signed-off-by: Padmarao Begari <padmarao.begari at microchip.com>
Reviewed-by: Anup Patel <anup.patel at wdc.com>
---
 arch/riscv/Kconfig             | 4 ++++
 arch/riscv/include/asm/types.h | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 30b05408b1..55eaee2da6 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -152,6 +152,10 @@ config 32BIT
 config 64BIT
 	bool
 
+config DMA_ADDR_T_64BIT
+	bool
+	default y if 64BIT
+
 config SIFIVE_CLINT
 	bool
 	depends on RISCV_MMODE || SPL_RISCV_MMODE
diff --git a/arch/riscv/include/asm/types.h b/arch/riscv/include/asm/types.h
index 403cf9a48f..b800b2d221 100644
--- a/arch/riscv/include/asm/types.h
+++ b/arch/riscv/include/asm/types.h
@@ -29,7 +29,11 @@ typedef unsigned short umode_t;
 
 #include <stddef.h>
 
+#ifdef CONFIG_DMA_ADDR_T_64BIT
+typedef u64 dma_addr_t;
+#else
 typedef u32 dma_addr_t;
+#endif
 
 typedef unsigned long phys_addr_t;
 typedef unsigned long phys_size_t;
-- 
2.17.1